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On the function and the probable origin of Ptolemy’s equant

 

作者: James Evans,  

 

期刊: American Journal of Physics  （AIP Available online 1984）
卷期: Volume 52, issue 12  

页码: 1080-1089

 

ISSN:0002-9505

 

年代: 1984

 

DOI:10.1119/1.13764

 

出版商: American Association of Physics Teachers

 

关键词: HISTORY;ASTRONOMY;ORBITS;PLANETS;SUN

 

数据来源: AIP

 

摘要:

We examine the roles of the equant point and the eccentric deferent circle in Ptolemy’s planetary theory. The necessity of these features of the model is demonstrated empirically by a study of the retrograde arcs of Mars. Finally, these results are used, together with available historical evidence, to suggest the line of investigation that probably led Ptolemy to his discovery of the equant.

 

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